netdev - Re: [PATCH] iptuntap: allow creation of multi-queue tun/tap device

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Message-ID: <20130610101617.6859448e@nehalam.linuxnetplumber.net>
Date:	Mon, 10 Jun 2013 10:16:17 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Sriram Narasimhan <sriram.narasimhan@...com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] iptuntap: allow creation of multi-queue tun/tap device

On Sun, 9 Jun 2013 14:11:23 +0300
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> On Thu, May 23, 2013 at 03:36:29PM -0700, Sriram Narasimhan wrote:
> > This patch adds multi_queue option to ip tuntap.
> > This allows IFF_MULTI_QUEUE flag to be specified during
> > tun/tap device creation enabling multi-queue support in tun/tap
> > device.
> > 
> > Example: ip tuntap add dev tap0 mode tap multi_queue
> > 
> > Signed-off-by: Sriram Narasimhan <sriram.narasimhan@...com>
> 
> Looks useful.
> 
> Stephen, what do you think?
> Could you pick this up please?
> 
> > ---
> >  ip/iptuntap.c |    4 +++-
> >  1 files changed, 3 insertions(+), 1 deletions(-)
> > 
> > diff --git a/ip/iptuntap.c b/ip/iptuntap.c
> > index 3d9ad7d..2391af2 100644
> > --- a/ip/iptuntap.c
> > +++ b/ip/iptuntap.c
> > @@ -38,7 +38,7 @@ static void usage(void)
> >  {
> >  	fprintf(stderr, "Usage: ip tuntap { add | del } [ dev PHYS_DEV ] \n");
> >  	fprintf(stderr, "          [ mode { tun | tap } ] [ user USER ] [ group GROUP ]\n");
> > -	fprintf(stderr, "          [ one_queue ] [ pi ] [ vnet_hdr ]\n");
> > +	fprintf(stderr, "          [ one_queue ] [ pi ] [ vnet_hdr ] [ multi_queue ]\n");
> >  	fprintf(stderr, "\n");
> >  	fprintf(stderr, "Where: USER  := { STRING | NUMBER }\n");
> >  	fprintf(stderr, "       GROUP := { STRING | NUMBER }\n");
> > @@ -168,6 +168,8 @@ static int parse_args(int argc, char **argv, struct ifreq *ifr, uid_t *uid, gid_
> >  			ifr->ifr_flags |= IFF_ONE_QUEUE;
> >  		} else if (matches(*argv, "vnet_hdr") == 0) {
> >  			ifr->ifr_flags |= IFF_VNET_HDR;
> > +		} else if (matches(*argv, "multi_queue") == 0) {
> > +			ifr->ifr_flags |= IFF_MULTI_QUEUE;
> >  		} else if (matches(*argv, "dev") == 0) {
> >  			NEXT_ARG();
> >  			strncpy(ifr->ifr_name, *argv, IFNAMSIZ-1);
> > -- 
> > 1.7.1
> > 
> > --
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